A Finite Conjugate Optical System with Equidistant Object and Image

Abstract

The invention discloses an object-image equidistant limited far conjugation optical system. The system comprises a first lens and a second lens which are sequentially arranged in the optical axial direction to formed a first doublet lens and a third lens and a fourth lens which form a second doublet lens, the optical power of the first doublet lens is 0.0206, the optical power of the second doublet lens is 0.0115, and the total optical power of the system is 0.0278. The system has the advantages that light emitted by a system object point passes through the first doublet lens group to generatea positive spherical aberration, the light reaches the second doublet lens group to achieve the purpose of correcting the spherical aberration, and finally high-quality imaging with completely corrected advanced aberration is obtained on an image plane. The system has the advantages that the working distance is long, the system can be used for measuring workpieces with different sizes and surfacetypes, a symmetric structure is adopted to eliminate comatic aberration, rayleigh criterion is met, measuring damage can be avoided by non-contact type measuring, the structure is simple, the cost islow, and the application is wide.

Description

technical field [0001] The invention relates to a conjugate optical system, in particular to a finite-distance conjugate optical system with equidistant objects and images, and belongs to the technical field of optical systems. Background technique [0002] In the current optical detection technology, non-contact detection has a great advantage, and can achieve high-precision measurement without damaging the surface of the object. However, for an optical system with a short working distance, there are the following problems when performing non-contact detection: [0003] 1. For general detection components, such as microscopic objective lenses, the caliber of the mechanical measuring head will be greatly restricted in the detection of small distances, so the measurement range is small, and the type of workpiece to be measured is relatively simple; [0004] 2. For the detection system with a short working distance, there are relatively large limitations when detecting compon...

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Problems solved by technology

[0003] 1. For general detection components, such as microscopic objective lenses, the caliber of the mechanical measuring head will be greatly restricted in the detection of small distances, so the measurement range is small, and the type of workpiece to be measured is relatively simple;

[0004] 2. For the detection system with a short working distance, there are relatively large limitations when detecting components on different step surfaces, and it is necessary to change the position of the workpiece for multiple measurements to be able to accurately measure

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